Bash concatenate less than sign to string read from file

Question

The title says it all. I know that this is possible when not reading a file because this works. However, when I try to modify it to read a value from a file, I get weird results...

$ num1="1.291858E+01"
$ num2="1E-5"
$ echo $num1'>'$num2
    1.291858E+01>1E-5
$ cat sum.csv
    1.291858e+01
$ num1=`cat sum.csv | sed -e 's/e/E/'`
$ echo $num1
    1.291858E+01
$ echo $num1'>'$num2
    >1E-5858E+01

Edit:

I would expect the outcome to be

1.291858E+01>1E-5

And here is what I'm copying directly from the terminal

test $ num1="1.291858E+01"
test $ num2="1E-5"
test $ echo $num1'>'$num2
1.291858E+01>1E-5
test $ cat sum.csv
1.291858e+01
test $ num1=`cat sum.csv | sed -e 's/e/E/'`
test $ echo $num1
1.291858E+01
test $ echo $num1'>'$num2
>1E-5858E+01
test $

Quote variable expansions in double quotes as a matter of habit. — Mad Physicist, Apr 12 '17 at 18:10
Also, I am unable to reproduce the last line. It yields `1.291858E+01>1E-5` as expected for me. I think you are screwing up something else you aren't telling us. — Mad Physicist, Apr 12 '17 at 18:12
What is question here? Provide an input with a exact _expected_ output — Inian, Apr 12 '17 at 18:12

score 3 · Accepted Answer · answered Apr 12 '17 at 18:17

3

Your lines end in control-Ms in sum.csv, presumably because it was create on Windows. Use cat -v sum.csv to see them and run dos2unix or similar to remove them.

answered Apr 12 '17 at 18:17

Ed Morton

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Bash concatenate less than sign to string read from file

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